AT&T Nation Plans & Partner networks

I just want to clarify what the "no roaming or long distance charges" feature of the Nation plans mean; does that mean that I can talk anywhere where there is any kind of service, including "Partner" networks according to AT&T's coverage map, without paying any extra fees (assuming I don't use it excessively or try to use data roaming)? And one minute of talking on a partner network subtracts only one minute of talk time from my monthly minutes?

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